I was thinking of upgrading my sound system in my 91 YJ. I don't have any rear speakers at all and was thinking about buying those THOR soundwedges. I would put by own speakers in them and buy the empty boxes. I see steelhorse also has a similiar product. Anybody had any expereinces with these products please let me know. The 91 YJ had the old style roll bars so the overhead soundbar is out of the question.